Coaster-brake.



S., SMITH,

GOASTBR BRAKE.

APPLICATION FILED 001210, 191s.

Patented July 21, 19414;.v

2 SHEETS-SHEET l'.

Ill

WIM/wow Unir SIDNEY SM'IH, OF DETROIT, MICHIGAN.

COASTER-BRAKE.

measles.

To all whom it may concern.

Be it known that I, SIDNEY SMITH, a British subject, residing atDetroit, county of Wayne, State of Michigan, have invented a certain newand useful Improvement in Coaster-Brakes, and declare the following tobe a full, clear, and exact description of the same, such as will enableothers skilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification.

My invention relates to an improvement in coaster brakes, shown in theaccompanying drawings and more particularly pointed out in the followingspecification and claims.

One of the objects of my invention is to simplify the generalconstruction of the device thereby affording a corresponding reductionin the cost of manufacture.

Another feature of the invention is to provide a relatively largebraking surface while reducing the general dimension of the device,through the use of driving cams adapted and arranged to provide adequatestrength and stability.

Another feature is to insure a more positive driving relation betweenthe parts directly actuated by the driving sprocket and the co-actingelements governing the rotation of the wheel hub.

Another feature is the ease with which the parts may be replaced whenrequired.

Other advantages and improvements will hereafter appear.

In the drawings accompanying this specificationz-Figure 1 is alongitudinal sectional view of the device mounted in its bearings in therear forks of a bicycle or motorcycle, indicating the relative positionof the parts when coasting. Fig. 2 is a crosssectional view on line 2 2of Fig. 1, looking in the direction ofy the arrow. Fig. 3 is across-sectional view on line 8 3 of Fig. 1. Fig. A is a longitudinalsectional view of a fragmentary portion of the device, indicating theposition of the parts when driving the wheel. Fig. 5 is an elevation(with parts broken away and in section) of the several elementsconstituting the brake grouped to indicate in a general way theirco-acting relation. Fig. 6 is a perspective view of one portion of theco-acting annular cam provided with a ratchet face. Fig. 7 is a per-Specication of Letters Patent.

Application filed October l10, 1913.

Patented July 21, 191e.

serial No. 794,377.

spectivel view of the spring collar. Fig. 8 is a perspective view of thesleeve cam. Fig. 9 `1s a fragmentary perspective view of the hub D, andE a ball race collar screwed to vthe axle A.

A indicates a nut threaded on the axle A bearing against a washer a inturn engaging j the depending bifurcated portion of the fork B.

F indicates the wheel hub. G an annular ring loosely sleeved upon thehub of the sprocket wheel C having al ratchet face g and projecting lugsg extendinginto depressions .f iny the wheel hub that they may berotated together.

H indicates a ball bearing housed within the ball race formed'in thesprocket wheel hub, ring Gr, and the wheel hub.

I denotes an annular ring loosely sleeved on the sprocket hub D havingon one side a ratchet face i co-acting with the ratchet face g of thering G, its opposite side being provided with a cam face z".

J indicates a collar having a screw-threaded engagement with thesprocket wheel hub D, secured against displacement by the annularlockingring or nut J. The collar J is provided with a cam face j co-acting withthe cam face z" of the ring l.

K denotes a sleeve rotatable on the axle A, provided with a plurality ofcams Ze, and recessed at one end to receive the projecting tongue D ofthe sprocket wheel hub D, whereby it maybe revolved through the r0-tation of the sprocket wheel.

L denotes a splitspring sleeve surrounding the cam sleeve K, adapted tobear against the inner face of the wheel hub.

K, K2, K3 indicate rolls lodged between the cam sleeve K and the springsleeve L.

M denotes a spring collar secured against ,usual yrn-a'nner by backpedaling.

rotation by suitable detente m to the spring sleeve L, Iand overlappingthe collar J (bein'g f slightly dished 'to conform to the shape oithelatter) and extending onto and into a recess 2 in the annular ring I.'Io increase the resiliency of the collar it is divided as indicated atm to aord a yielding edge bearing upon the ring I. l

N is a ball race collar A'screwed on the end of thel axle provided witha ratchet face ln,

between which and the washer a of the nu't A2, is clamped the dependingrnernbers ot Upon giving the 'Sprocket when c a foi- 1 manner, hub Dcarrying the annular collar J V-forces the annular ring I 'to ftheright,

lthe ratchet face of which engages the coaotinfg ratchet tace or the:annular ring' `Gr engaged to the wheel hu'b through the lugs g. Theannular I is held against rotation by the dished spring collar order toinsure ithbeingl forced into engage nrent 'with the ring@ through the'rotation of the annular 'colla-r J.

When it is desired to coast, the :rider ceases to pedal. whereupon thewheel hub v rotating more rapidly than the hub y'of thev sprocket, the'annular ring I is forced out of its vengagernent with the G, vthroughythe relative difference in steed between the` ratchet face zg of therin'g and the ratchet face t of the ring iI, thereby causing thevratchet faces 4of the respective rings to ride up upon those 'of theopposing ratchet 'iorcv 'ing them apart ;-th'e udished lspring coj-ll'arM vserving to secure the annular against rotation and inabuttingrelationwith the col-lar J asindicated in Fig. 1.

The braking action is' lobtained in the The hub D of the sprocket wheelupon being .ro-

tated a reverse nia-nner fto 'that just described, reverses the rotationAof the cani `K `connected 'with the sprocket wheel hub by Vthe tonguelD', projecting from lthe -end# oi. ythe latter, thereby causing the'rolls IC,-

K2, K3, to ride up `the helical `canas 7o `of the sleeve expanding the`spring sleeve L :into rictional Contact with the wheel A"hub providinga braking action upon the wheel.

-By mal'ring fthe velement Gw'hich kis locked lto the wheel :hub -F ybythe :lugs g' removable, -a great :saving 4is :eifected i-n the costofmanufactura, as it may be more readily machined while the 'parts areeasily assembled. This also applies to the element J, screwed upon thehub of the sprocket wheel. In fact, 'as previously indicated, it is theobject of the present invention to construct the several parts so thatthe cost of manufacture may be reduced and the efiiciency of the devicecorrespondingly increased. v

Having thus described iny invention, what I claim is l. In a coasterbrake, a stationary axle, a sprocket wheel,l a hub for said sprocketwheel, a collar having 'a cain tace carried by the sprocketw-heel huband rotatable tliorexvitli, an annular ring free to rotate on the hubprovided with a cam face adapted ito be 'actuated by the cani face ofthe collar having on its opposite side a ratchet face, yield'ableinea'ns to secure the annular ring against rotation with the hub whenbeing actuated by the Cain, a wheel hub sleeved over the sprocket wheelhub, and an annular ring free to 'turn upon the sprocket wheel hub andadapted to rotate with said wheel 'hub having a ratchet face to -co-aotwith tthe `ratchet face of the annular ring. p

2. In a coaster brake, a `stationary axle, a sprocket wheel, fa hub forthe sprocket wheel free to turn upon the axle, a detachable collarsecured tothe sprocket wheel hub having a cam face, 'an annular vringfree to ro-y tate 'onsaid hub provided with a cam face adapted to beactuated by the 'co-acting'cain face of the collar, having on itsopposite side a ratchet tace, yiel'dable nica-nstohold the annular ring4against 'rotation with the hub when actuated by the cani, a lwheel hubsleeved over the sprocket ywheel hub, and an annular ring free 'to turnupon the sprocket wheel hub engagedto the wheel hub, and lhav-ling aratchet 'face to lco`act with the ratchet face of the -ii''st namedannular ring, whereby the wheel ihub may turn with the sprocket wheelhub.

'3. Ina coaster brake, a stationary axle, a sprocket wheel, -a hubcarry-ing said sprocket wheel, a collar having fa 'cani tace carried bythe sprocket wheelvhub and rotatable therewith, :annular ring 'looselyVsleeved on the hub Aprovided witha cani ace adapted to be actuated bythe cani face of the collar,

having on its opposite side a ratchet face, an fannuflar ring free toturn upon the sprocket wheel hub and engaged t0 the wheel hub having aratchet face to co-act with the ratchet face ofthe annular ring, asleeve provided with a plurality of cams loosely mounted on the axleengaging the sprocket wheel hub that it may be rotated thereby, an

exfpansible spring sleeve inclosing said cani 'sleeve and housed 'withinthe wheel hub,

means to secure said sleeve against rotation,

a plurality of rolls co-aoting with said Cam tion with the cani facecollar that it may be to expand said sleeve into braking relationactuated thereby. 10 with the wheel hub, and a spring collar selntestimony whereof, I sign this specificured to said sleeve adapted tooverlap the cation in the presence of two witnesses.

collar having a Cam face carried by the SIDNEY SMTH. sprocket wheel huband to engage the an- Witnesses:

nular ring, whereby said annular ring is GRACE E. WYNKoor,

held against rotation and in abutting rela- SAMUEL E. THOMAS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

